Cancer is a complex group of diseases characterized by uncontrolled... Show more
Science83 views·Updated Jun 2, 2026·57 pagesUnderstanding Cancer: Causes, Treatment, and Prevention
S
Safiya Abdi@afiyabdi_ellt
1 / 10
1
of 10
Cancer By The Numbers
Cancer impacts millions of lives in the United States. Only about 7.5% of all cancers are actually inherited, meaning most cases develop from environmental factors and lifestyle choices throughout a person's life.
An estimated 42% of cancer cases in the U.S. might be preventable through lifestyle modifications like avoiding tobacco, maintaining a healthy weight, and limiting alcohol consumption.
Today, there are approximately 15 million American cancer survivors, showing the progress made in treatment. However, about 39% of Americans will develop some form of cancer during their lifetime, highlighting why understanding this disease is so important.
With over 100 different types of cancer affecting various body tissues and organs, cancer is not a single disease but rather a collection of related diseases with common characteristics.
Did you know? While cancer sounds scary, nearly half of all cancer cases could potentially be prevented through lifestyle choices and early screening!
2
of 10
Cancer Prevalence and Incidence
Cancer impacts different populations in unique ways. For men in the U.S., the four most common cancers are prostate, lung, colorectal, and bladder cancers. Women most frequently develop breast, lung, colorectal, and uterine cancers.
Lung cancer is responsible for the most cancer deaths in the United States, followed by colorectal, pancreatic, and breast cancer. These top four deadliest cancer sites claim thousands of lives annually.
The National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) Program provides comprehensive data on cancer statistics across the country. This resource tracks both incidence rates (new cases) and death rates for all major cancer types.
When evaluating a specific cancer diagnosis like Vanessa's colorectal cancer, understanding both incidence and mortality rates helps doctors assess the overall prognosis and treatment options.
Important: Cancer incidence rates can vary significantly by age, sex, race, ethnicity, and geographic location - knowing these patterns helps guide screening recommendations and prevention efforts.
3
of 10
Rising Colorectal Cancer in Young Adults
Something alarming is happening with colorectal cancer - it's increasingly affecting younger people. Looking at data from 2000 to 2009, cases of colorectal cancer in people under age 50 have been steadily rising, even while rates for older adults have declined.
The graph shows a troubling upward trend in young-onset colorectal cancer, increasing from about 5.6 to 6.8 cases per 100,000 population over just a decade. This represents approximately a 20% increase in this age group.
Meanwhile, colorectal cancer rates in people over age 50 have shown the opposite pattern, decreasing from about 200 to 150 cases per 100,000 population during the same period. This decline is likely due to increased screening in older adults.
This contrasting pattern has prompted medical professionals to call for action, including reevaluating screening guidelines and investigating why younger people are developing this disease at higher rates.
Research alert: The American Cancer Society now recommends starting colorectal cancer screening at age 45 instead of 50 in response to this concerning trend in younger adults.
4
of 10
Preventable Cancers
An eye-opening fact: over 42% of cancer cases could potentially be prevented through lifestyle modifications. Understanding the major causes of preventable cancers gives us power to reduce our risk.
Smoking remains the leading preventable cause, responsible for 19% of all cancer cases. This includes not just lung cancer, but also cancers of the throat, mouth, pancreas, bladder, and more.
Obesity ranks as the second major contributor at 7.8%, linked to at least 13 different types of cancer. Alcohol consumption accounts for 5.6% of cases, while UV radiation from the sun and tanning beds causes 4.7%.
Other preventable factors include physical inactivity (2.9%) and poor diet (1.9%). Making changes in these areas can significantly reduce cancer risk over a lifetime.
Take action: Even small lifestyle changes can have a big impact on your cancer risk - quitting smoking, maintaining a healthy weight, and protecting your skin from the sun are three powerful steps you can take today.
5
of 10
Cancer Prevention
Much cancer research focuses on identifying and avoiding agents that cause cancer, known as carcinogens. Different carcinogens tend to target specific organs and tissues in the body.
Environmental exposures play a significant role in cancer development. For example, ultraviolet radiation from sunlight is strongly linked to skin cancer, while inhaled carcinogens in cigarette smoke primarily affect the lungs.
Dietary choices can also influence cancer risk. Smoked foods contain compounds that may increase the risk of stomach and intestinal cancers. Similarly, food contaminated with mildewed grain can contain toxins that target the liver.
Infectious agents represent another major pathway to cancer. The human papillomavirus (HPV) transmitted through unprotected sex is the primary cause of cervical cancer. Certain other viruses can lead to lymphomas affecting the thymus and lymph nodes.
Prevention tip: Avoiding known carcinogens like tobacco smoke, excessive UV exposure, and certain infectious agents can significantly reduce your lifetime cancer risk.
6
of 10
Early Detection of Cancer
Detecting cancer early dramatically improves treatment outcomes and survival rates. Different cancer types require different screening approaches, with varying recommendations by age, gender, and risk factors.
For breast cancer, women at average risk should begin annual mammograms at age 45. After age 55, they can switch to screening every two years or continue yearly if desired.
Cervical cancer screening should start at age 25 with an HPV test every 5 years. For lung cancer, screening with low-dose CT scans is recommended for those with significant smoking history, starting at age 50.
Prostate cancer screening considerations begin at age 50 for average-risk men, but earlier (age 45) for high-risk individuals including African Americans and those with family history. The screening includes both digital rectal examination and PSA blood testing.
Early detection saves lives: Following recommended screening guidelines for your age, gender, and risk factors is one of the most powerful steps you can take to protect yourself from advanced cancer.
7
of 10
Cancer Screening Recommendations
Following established screening guidelines is crucial for early detection. For breast cancer, women ages 45-54 should get mammograms annually, while those 55+ can consider switching to every other year.
Cervical cancer prevention has improved with HPV testing. Women aged 25-65 should have a primary HPV test every 5 years. This test looks for high-risk types of human papillomavirus that can lead to cervical cancer.
Lung cancer screening recommendations target high-risk individuals - those aged 50-80 who currently smoke or have quit within 15 years and have at least a 20 pack-year history. The screening uses low-dose CT scans.
For prostate cancer, screening recommendations vary by risk level. Men at average risk should discuss screening at age 50, while high-risk men (including African Americans and those with family history) should begin discussions earlier, at age 45 or even 40.
Remember: These are general guidelines from the American Cancer Society. Your doctor may recommend different screening schedules based on your personal health history and risk factors.
8
of 10
Colorectal Cancer Screening Guidelines
The American Cancer Society recommends that adults at average risk begin colorectal cancer screening at age 45 - earlier than previous guidelines. This change reflects the rising rates of colorectal cancer in younger adults.
For adults aged 45-75, regular screening is strongly recommended. Several testing options are available, including stool-based tests that look for signs of cancer in a person's stool and visual exams like colonoscopy that directly examine the colon and rectum.
Adults aged 76-85 should make screening decisions in consultation with their doctors, considering their overall health, screening history, and personal preferences. After age 85, routine screening is no longer recommended.
The most important thing isn't which test you choose, but that you get tested. All positive results on non-colonoscopy screening tests should be followed up with a colonoscopy to complete the screening process.
Screening works: Regular colorectal cancer screening is one of the most powerful tools for preventing colorectal cancer because it can detect and remove precancerous polyps before they develop into cancer.
9
of 10
Warning Signs of Cancer
Knowing the warning signs of cancer can lead to earlier detection and treatment. There are seven key symptoms that should prompt a conversation with your doctor.
Changes in bowel or bladder habits that persist, such as constipation, diarrhea, or a change in the size of your stool, may signal colorectal or bladder cancer. Similarly, unusual bleeding or discharge from any body opening requires medical attention.
A sore that doesn't heal after several weeks could indicate skin cancer, while a thickening or lump in the breast or elsewhere might be a tumor. Difficulty swallowing or persistent indigestion could point to cancers of the esophagus, stomach, or throat.
An obvious change in a wart or mole, particularly in size, shape, or color, is a warning sign for skin cancer. Finally, a nagging cough or hoarseness that doesn't go away might indicate lung or throat cancer.
Act promptly: If you notice any of these warning signs, don't wait - schedule an appointment with your doctor. Early detection significantly improves treatment outcomes for most cancers.
10
of 10
Pathophysiology of Cancer
Cancer develops when normal cellular regulation breaks down. The American Cancer Society defines cancer as "a group of diseases characterized by uncontrolled growth and spread of abnormal cells."
Two major dysfunctions drive cancer development. First, defective cell proliferation occurs when cells multiply without the normal controls that limit growth. These cancer cells don't respond to signals that would normally stop division.
Second, defective cell differentiation means cancer cells fail to mature into specialized cells with specific functions. Instead, they remain in an immature state, continuing to divide and spread.
Understanding these fundamental dysfunctions helps explain why cancer cells behave differently from normal cells and provides the foundation for developing treatments that target these abnormal processes.
Cancer basics: At its core, cancer is a disease of abnormal cellular behavior, where cells grow uncontrollably and lose their normal specialized functions.
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Science83 views·Updated Jun 2, 2026·57 pagesUnderstanding Cancer: Causes, Treatment, and Prevention
S
Safiya Abdi@afiyabdi_ellt
Cancer is a complex group of diseases characterized by uncontrolled cell growth and spread of abnormal cells. Understanding the basics of cancer prevalence, prevention, detection, and treatment options is crucial for anyone wanting to grasp this major health challenge affecting... Show more
1
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Cancer By The Numbers
Cancer impacts millions of lives in the United States. Only about 7.5% of all cancers are actually inherited, meaning most cases develop from environmental factors and lifestyle choices throughout a person's life.
An estimated 42% of cancer cases in the U.S. might be preventable through lifestyle modifications like avoiding tobacco, maintaining a healthy weight, and limiting alcohol consumption.
Today, there are approximately 15 million American cancer survivors, showing the progress made in treatment. However, about 39% of Americans will develop some form of cancer during their lifetime, highlighting why understanding this disease is so important.
With over 100 different types of cancer affecting various body tissues and organs, cancer is not a single disease but rather a collection of related diseases with common characteristics.
Did you know? While cancer sounds scary, nearly half of all cancer cases could potentially be prevented through lifestyle choices and early screening!
2
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Cancer Prevalence and Incidence
Cancer impacts different populations in unique ways. For men in the U.S., the four most common cancers are prostate, lung, colorectal, and bladder cancers. Women most frequently develop breast, lung, colorectal, and uterine cancers.
Lung cancer is responsible for the most cancer deaths in the United States, followed by colorectal, pancreatic, and breast cancer. These top four deadliest cancer sites claim thousands of lives annually.
The National Cancer Institute's Surveillance, Epidemiology, and End Results (SEER) Program provides comprehensive data on cancer statistics across the country. This resource tracks both incidence rates (new cases) and death rates for all major cancer types.
When evaluating a specific cancer diagnosis like Vanessa's colorectal cancer, understanding both incidence and mortality rates helps doctors assess the overall prognosis and treatment options.
Important: Cancer incidence rates can vary significantly by age, sex, race, ethnicity, and geographic location - knowing these patterns helps guide screening recommendations and prevention efforts.
3
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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Rising Colorectal Cancer in Young Adults
Something alarming is happening with colorectal cancer - it's increasingly affecting younger people. Looking at data from 2000 to 2009, cases of colorectal cancer in people under age 50 have been steadily rising, even while rates for older adults have declined.
The graph shows a troubling upward trend in young-onset colorectal cancer, increasing from about 5.6 to 6.8 cases per 100,000 population over just a decade. This represents approximately a 20% increase in this age group.
Meanwhile, colorectal cancer rates in people over age 50 have shown the opposite pattern, decreasing from about 200 to 150 cases per 100,000 population during the same period. This decline is likely due to increased screening in older adults.
This contrasting pattern has prompted medical professionals to call for action, including reevaluating screening guidelines and investigating why younger people are developing this disease at higher rates.
Research alert: The American Cancer Society now recommends starting colorectal cancer screening at age 45 instead of 50 in response to this concerning trend in younger adults.
4
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Preventable Cancers
An eye-opening fact: over 42% of cancer cases could potentially be prevented through lifestyle modifications. Understanding the major causes of preventable cancers gives us power to reduce our risk.
Smoking remains the leading preventable cause, responsible for 19% of all cancer cases. This includes not just lung cancer, but also cancers of the throat, mouth, pancreas, bladder, and more.
Obesity ranks as the second major contributor at 7.8%, linked to at least 13 different types of cancer. Alcohol consumption accounts for 5.6% of cases, while UV radiation from the sun and tanning beds causes 4.7%.
Other preventable factors include physical inactivity (2.9%) and poor diet (1.9%). Making changes in these areas can significantly reduce cancer risk over a lifetime.
Take action: Even small lifestyle changes can have a big impact on your cancer risk - quitting smoking, maintaining a healthy weight, and protecting your skin from the sun are three powerful steps you can take today.
5
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Cancer Prevention
Much cancer research focuses on identifying and avoiding agents that cause cancer, known as carcinogens. Different carcinogens tend to target specific organs and tissues in the body.
Environmental exposures play a significant role in cancer development. For example, ultraviolet radiation from sunlight is strongly linked to skin cancer, while inhaled carcinogens in cigarette smoke primarily affect the lungs.
Dietary choices can also influence cancer risk. Smoked foods contain compounds that may increase the risk of stomach and intestinal cancers. Similarly, food contaminated with mildewed grain can contain toxins that target the liver.
Infectious agents represent another major pathway to cancer. The human papillomavirus (HPV) transmitted through unprotected sex is the primary cause of cervical cancer. Certain other viruses can lead to lymphomas affecting the thymus and lymph nodes.
Prevention tip: Avoiding known carcinogens like tobacco smoke, excessive UV exposure, and certain infectious agents can significantly reduce your lifetime cancer risk.
6
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Early Detection of Cancer
Detecting cancer early dramatically improves treatment outcomes and survival rates. Different cancer types require different screening approaches, with varying recommendations by age, gender, and risk factors.
For breast cancer, women at average risk should begin annual mammograms at age 45. After age 55, they can switch to screening every two years or continue yearly if desired.
Cervical cancer screening should start at age 25 with an HPV test every 5 years. For lung cancer, screening with low-dose CT scans is recommended for those with significant smoking history, starting at age 50.
Prostate cancer screening considerations begin at age 50 for average-risk men, but earlier (age 45) for high-risk individuals including African Americans and those with family history. The screening includes both digital rectal examination and PSA blood testing.
Early detection saves lives: Following recommended screening guidelines for your age, gender, and risk factors is one of the most powerful steps you can take to protect yourself from advanced cancer.
7
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Cancer Screening Recommendations
Following established screening guidelines is crucial for early detection. For breast cancer, women ages 45-54 should get mammograms annually, while those 55+ can consider switching to every other year.
Cervical cancer prevention has improved with HPV testing. Women aged 25-65 should have a primary HPV test every 5 years. This test looks for high-risk types of human papillomavirus that can lead to cervical cancer.
Lung cancer screening recommendations target high-risk individuals - those aged 50-80 who currently smoke or have quit within 15 years and have at least a 20 pack-year history. The screening uses low-dose CT scans.
For prostate cancer, screening recommendations vary by risk level. Men at average risk should discuss screening at age 50, while high-risk men (including African Americans and those with family history) should begin discussions earlier, at age 45 or even 40.
Remember: These are general guidelines from the American Cancer Society. Your doctor may recommend different screening schedules based on your personal health history and risk factors.
8
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Colorectal Cancer Screening Guidelines
The American Cancer Society recommends that adults at average risk begin colorectal cancer screening at age 45 - earlier than previous guidelines. This change reflects the rising rates of colorectal cancer in younger adults.
For adults aged 45-75, regular screening is strongly recommended. Several testing options are available, including stool-based tests that look for signs of cancer in a person's stool and visual exams like colonoscopy that directly examine the colon and rectum.
Adults aged 76-85 should make screening decisions in consultation with their doctors, considering their overall health, screening history, and personal preferences. After age 85, routine screening is no longer recommended.
The most important thing isn't which test you choose, but that you get tested. All positive results on non-colonoscopy screening tests should be followed up with a colonoscopy to complete the screening process.
Screening works: Regular colorectal cancer screening is one of the most powerful tools for preventing colorectal cancer because it can detect and remove precancerous polyps before they develop into cancer.
9
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Warning Signs of Cancer
Knowing the warning signs of cancer can lead to earlier detection and treatment. There are seven key symptoms that should prompt a conversation with your doctor.
Changes in bowel or bladder habits that persist, such as constipation, diarrhea, or a change in the size of your stool, may signal colorectal or bladder cancer. Similarly, unusual bleeding or discharge from any body opening requires medical attention.
A sore that doesn't heal after several weeks could indicate skin cancer, while a thickening or lump in the breast or elsewhere might be a tumor. Difficulty swallowing or persistent indigestion could point to cancers of the esophagus, stomach, or throat.
An obvious change in a wart or mole, particularly in size, shape, or color, is a warning sign for skin cancer. Finally, a nagging cough or hoarseness that doesn't go away might indicate lung or throat cancer.
Act promptly: If you notice any of these warning signs, don't wait - schedule an appointment with your doctor. Early detection significantly improves treatment outcomes for most cancers.
10
of 10Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Pathophysiology of Cancer
Cancer develops when normal cellular regulation breaks down. The American Cancer Society defines cancer as "a group of diseases characterized by uncontrolled growth and spread of abnormal cells."
Two major dysfunctions drive cancer development. First, defective cell proliferation occurs when cells multiply without the normal controls that limit growth. These cancer cells don't respond to signals that would normally stop division.
Second, defective cell differentiation means cancer cells fail to mature into specialized cells with specific functions. Instead, they remain in an immature state, continuing to divide and spread.
Understanding these fundamental dysfunctions helps explain why cancer cells behave differently from normal cells and provides the foundation for developing treatments that target these abnormal processes.
Cancer basics: At its core, cancer is a disease of abnormal cellular behavior, where cells grow uncontrollably and lose their normal specialized functions.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user